Ellen, that's an excellent question! A banana bread that sinks in the middle after it's been removed from the oven is probably just a bit underbaked. On the other hand, if it sinks while it's still baking, there's a good chance that the ingredients were over-mixed. You only want to stir the batter the minimum amount to get the ingredients all combined, and having some lumps in it is totally fine. Happy baking! Kat@KAF

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